when does comfrey leaf out in zone 4

I am not growing comfrey yet and am planning where to site it. I had the possibly bright idea that it could be interplanted with spring ephemerals (plants that bloom April/May and decline almost to the point of invisibility by June/July). I am planning on the Bocking 14 variety and wondered if anyone could tell me the approximate time it leafs out in the spring and whether the clump will fill in to full width before the end of May.

Thanks!

Around here, it fills in toward the end of may, so your timing should be perfect.

thanks for the info, Dan!

Kelly Rued wrote:I am planning on the Bocking 14 variety and wondered if anyone could tell me the approximate time it leafs out in the spring and whether the clump will fill in to full width before the end of May.

I've found it doesn't fill in great till the next year.